10 research outputs found
Interactions Between Friction Modifiers and Dispersants in Lubricants: The Case of Glycerol Monooleate and Polyisobutylsuccinimide-Polyamine
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Structure and Friction of Stearic Acid and Oleic Acid Films Adsorbed on Iron Oxide Surfaces in Squalane
Get PDFFriction Modelling in Boundary Lubrication Considering the Effect of MoDTC and ZDDP in Engine Oils
No full textA predictive friction model has been developed in boundary lubrication conditions to understand the sensitivity of the model to molybdenum dithiocarbamate (MoDTC), a friction modifying additive and zinc dialkyldithiophosphate (ZDDP), an antiwear additive in engine oil. Controlled experiments were performed on a block-on-ring tribometer to record the friction performance of the tribofilms produced by ZDDP and MoDTC additives under conditions representative of boundary lubrication conditions in the cam and follower interface. A statistical approach was used to develop an empirical friction model. The boundary lubrication friction model considers ZDDP and MoDTC additive concentration in an ester-containing polyalphaolefin (PAO) base oil, temperature and sliding speed as the factors affecting friction. The friction significantly depends on ZDDP, MoDTC, speed and temperature; showing a ZDDP/MoDTC synergetic effect on reducing friction. The results show good agreement between the measured and the predicted friction values, with a high correlation coefficient
Phosphorus-31 NMR investigation of the comparative hydrolytic breakdown of nickel(II) and cadmium(II) versus zinc(II) bis(O,O-diethyl dithiophosphates) in an aqueous medium
No full textFormation and Characterization of Model Iron Sulfide Scales with Disulfides and Thiols on Steel Pipeline Materials by an Aerosol-Assisted Chemical Vapor Method
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aerosol-assisted chemical vapor method leading to iron sulfide scales
of varying phases and morphologies by reaction of pipeline steels
with sulfur compounds has been developed. This chemical vapor reaction
methodology is useful for generating model iron sulfide scales pertinent
to the interaction of sour crude oil with piplelines used in the oil
and gas industry
Formation and Characterization of Model Iron Sulfide Scales with Disulfides and Thiols on Steel Pipeline Materials by an Aerosol-Assisted Chemical Vapor Method
No full textA Boundary Lubrication Friction Model Sensitive to Detailed Engine Oil Formulation in an Automotive Cam/Follower Interface
No full textThin Films of Molybdenum Disulfide Doped with Chromium by Aerosol-Assisted Chemical Vapor Deposition (AACVD)
No full textA combined single-source precursor
approach has been developed
for the deposition of thin films of Cr-doped molybdenum disulfide
(MoS<sub>2</sub>) by aerosol-assisted chemical vapor deposition (AACVD).
TrisÂ(diethyldithiocarbamato)ÂchromiumÂ(III) can also be used for the
deposition of chromium sulfide (CrS). Films have been analyzed by
a range of techniques including scanning electron microscopy (SEM),
energy dispersive X-ray (EDX) spectroscopy, Raman spectroscopy, and
powder X-ray diffraction (pXRD) to elucidate film morphology, composition,
and crystallinity. The presence of Cr in the MoS<sub>2</sub> films
produces a number of striking morphological, crystallographic, and
nanomechanical changes to the deposited films. The chromium dopant
appears to be uniform throughout the MoS<sub>2</sub> from the scanning
transmission electron microscopy (STEM) EDX spectrum imaging of nanosheets
produced by liquid-phase exfoliation of the thin films in <i>N</i>-methyl-2-pyrollidone
